Fluke 568, 566 How the Thermometers Work, Operating the Thermometer, Temperature Measurement

Infrared Thermometers

How the Thermometers Work

How the Thermometers Work

Infrared thermometers measure the surface temperature of an object. The thermometer’s optics sense emitted, reflected, and transmitted energy, which is collected and focused onto a detector. The unit’s electronics translate the signal into a temperature reading which the unit displays (see Figure 3).

Reflected energy

Target

Transmitted energy

Emitted

Energy

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Figure 3. How the Thermometer Works

Operating the Thermometer

Temperature Measurement

To measure temperature, point the thermometer at an object and pull the trigger. You can use the laser pointer to help aim the thermometer. You may also insert the K-type thermocouple probe for contact measurement. Be sure to consider distance-to-spot size ratio and field of view (see “Distance and Spot Size” and “Field of View”). The temperature appears on the display.

Note

The laser is used for aiming purposes only and is not related to temperature measurement.

The thermometer features an auto off function that automatically powers down the thermometer after 20 seconds of inactivity. To turn the thermometer on, pull the trigger.

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